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Speedyman An intelligent read of Lewis would make a reasonable man conclude that belief in God is as silly as belief in fairies and leprechauns. I mentioned other religious philosophers like Craig and Van Til, because, even though I disagree with their conclusions, I give them credit for careful and reasoned argument. Lewis on the other hand is a fiction writer, so he assumes that merely stating something in clear language is adequate. It's not. Lewis is dime-store apologetics for people who are unwilling or unable to read anything more advanced.
Mere Christianity is baby food.
Who says I believe in a "rational universe?" Since the universe has no mind, it can no more be "rational" than a rock or a cloud can be "rational." The flaw in your thinking is the blithe assertion that "God is rational" when you're completely unable to explain where God came from or how he developed rationality, other than the empty claim that "he just is."
Your "God" is nothing more than a semantic stopsign, meaning it doesn't answer the question; it merely halts further questioning.
And the child asked:Q: Where did this rock come from?
A: I chipped it off the big boulder, at the center of the village.
Q: Where did the boulder come from?
A: It probably rolled off the huge mountain that towers over our village.
Q: Where did the mountain come from?
A: The same place as all stone: it is the bones of Ymir, the primordial giant.
Q: Where did the primordial giant, Ymir, come from?
A: From the great abyss, Ginnungagap.
Q: Where did the great abyss, Ginnungagap, come from?
A: Never ask that question.